The message %IP_VFR-4-FRAG_TABLE_OVERFLOW suggests that your router is handling lots of fragmented IP packets and is running low on the buffer that holds the data to identify the fragments. This buffer can be enlarged using the command ip virtual-reassembly max-reassemblies 512 on your Gi0/0 interface to allow 512 packets to be virtually reassembled for ACL purposes at a time. However, a more appropriate course of action would be to identify why are you receiving so many fragmented packets. Clearly the virtual reassembly size of 64 packets is the cause of this.

Normally one of the causes of fragmentation could be a wrongly set mtu. From the top of my head 1492 should be ok for a ppp connection but you might want to check (with your ISP).
The other thing you can do is, like thrigger said, raise the value of the reassembly (though that might not address the cause of the issue).

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